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BiologyClass 10CBSE

What is a decomposer?

A decomposer breaks down dead organic matter into simpler inorganic substances, returning nutrients to the soil.Examples: Bacteria, fungi (mushrooms, moulds)Break down proteins and cellulose into CO₂, water, and minerals.Essential for completing nutrient cycles

BiologyClass 10CBSE

What is an autotroph?

An autotroph ("self-feeder") produces its own food from simple inorganic substances using an external energy source.Photoautotrophs: Use sunlight (plants, algae, cyanobacteria — via photosynthesis).Chemoautotrophs: Use chemical energy (certain deep-sea bacteria).<li data-list-item-id="e6eb30cc93bb6323e221b5d93d81c0c24

BiologyClass 10CBSE

What are life processes?

Life processes are the essential biological activities all living organisms must carry out to remain alive.ProcessFunctionNutritionObtaining and using foodRespirationReleasing energy from foodTransportationMoving substances within the bodyExcretionRemoving metabolic wasteGrowthIncreasing i

BiologyClass 10CBSE

Which processes are essential for maintaining life?

The four most immediately essential: nutrition, respiration, transportation, and excretion.Nutrition: Cells starve without food.Respiration: Cellular work stops within seconds without energy.Transportation: Circulation failure is immediate

BiologyClass 10CBSE

What is nutrition?

Nutrition is the process by which organisms obtain and utilize food for energy, growth, repair, and body maintenance.ModeDescriptionExamplesAutotrophicMakes own foodPlants (photosynthesis)HolozoicIngests solid foodHumans, lionsSaprophyticAbsorbs from dead matterFungiParasiticFeeds

BiologyClass 10CBSE

What is the role of saliva in digestion?

Saliva (produced by salivary glands) plays critical roles in the first stage of digestion:Enzyme action: Salivary amylase (ptyalin) begins breaking down starch into maltose.Lubrication: Moistens food to form a soft bolus for swallowing.Dissolving food:</s

BiologyClass 10CBSE

What outside raw materials are used by organisms to maintain life?

Raw materials from the environment:Oxygen (O₂): Used in aerobic respiration to release energy.Food/Nutrients: Carbohydrates, proteins, fats, vitamins, minerals — energy and building blocks.Water (H₂O): Essential for almost

BiologyClass 10CBSE

What is aerobic respiration?

Aerobic respiration breaks down glucose in the presence of oxygen to release energy.Overall equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (36–38 ATP)Three stages:Glycolysis — cytoplasm; glucose → pyruvateKrebs Cycle — mitochondrial matrix; pyruvate fully oxidized<li dat

BiologyClass 10CBSE

What is a vaccine?

A vaccine is a biological preparation that trains the immune system to recognise and fight a specific pathogen without causing actual disease.Introduces a harmless antigen → immune system creates antibodies + memory cells.If real pathogen invades later → rapid, powerful immune response.Examples: Polio vaccine, M

BiologyClass 10CBSE

What is a pathogen?

A pathogen is any microorganism or agent that causes disease in a host.TypeExamplesBacteriaTB, cholera, typhoidVirusesInfluenza, HIV, COVID-19FungiRingworm, athlete's footProtozoaMalaria, amoebic dysenteryHelminthsTapeworm, roundwormPathogens cause dam

BiologyClass 10CBSE

What is a communicable disease?

A communicable disease (infectious/contagious) can be transmitted from one person to another.Methods of transmission:Direct contact touching, kissing (e.g., cold sores)Droplets coughing, sneezing (influenza, TB, COVID-19)Contaminated food/water cholera, typhoid<li d

BiologyClass 10CBSE

What is an antigen?

An antigen is any substance usually a protein on a pathogen or foreign particle that triggers an immune response.Causes the body to produce antibodies shaped to bind to and neutralise it."Antigen" = "antibody generator"Lock and key analogy: each antigen has a

BiologyClass 10CBSE

What are endocrine glands?

Endocrine glands are ductless glands that secrete hormones directly into the bloodstream.GlandHormoneFunctionPituitaryGrowth hormone, TSHControls other glands, growthThyroidThyroxineRegulates metabolismAdrenalAdrenalineFight-or-flight responsePancreas (islets)Insulin, Glucagon</td

BiologyClass 10CBSE

What is transpiration? List two functions.

Transpiration is the loss of water vapour from plants through stomata (and cuticle/lenticels).Two key functions:Creates transpiration pull: Water evaporates from leaves → pulls water upward from roots through xylem — the main mechanism driving water/mineral transport in tall trees.Cooling effect: Ev

BiologyClass 10CBSE

What is bone marrow and what does it do?

Bone marrow is the soft, spongy tissue inside large bones (femur, sternum, hip bones).Two types:Red bone marrow: Produces all blood cells (red blood cells, white blood cells, platelets) process called haematopoiesis.Yellow bone marrow: Mostly fat; energy reserve; can convert to red ma

BiologyClass 10CBSE

What is a chromosome?

A chromosome is a thread-like structure of tightly coiled DNA and proteins (histones) inside cell nuclei, carrying genetic information as genes.Humans: 46 chromosomes in 23 pairs.22 pairs = autosomes; 1 pair = sex chromosomes (XX female, XY male).Each chromosome contains hundreds to thousa

BiologyClass 10CBSE

What is the full form of DNA?

DNA = Deoxyribonucleic AcidDeoxy = deoxyribose sugar (one oxygen fewer than ribose)Ribo = ribose sugar backboneNucleic = found in the cell nucleusAcid<

BiologyClass 10CBSE

What is a genome?

A genome is the complete set of genetic information (all DNA) in an organism all genes and non-coding sequences.Human genome: ~3 billion base pairs and ~20,000–25,000 genes.Every cell (except red blood cells) contains the complete genome.Human Genome Project (completed 2003) sequenced the entir

BiologyClass 10CBSE

What is an allele?

An allele is one of two or more versions of the same gene at the same locus on homologous chromosomes.Every person inherits two alleles per gene one from each parent.Dominant: Expressed even when one copy present (e.g., brown eyes B)Recessive: Express

BiologyClass 10CBSE

What is a nucleotide?

A nucleotide is the basic building block of DNA and RNA, consisting of three components:Nucleotide = Phosphate Group + Sugar + Nitrogenous Base Sugar: Deoxyribose in DNA; ribose in RNANitrogenous bases in DNA: A, T, G, C (in RNA, Thymine → Uracil)<li d

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